Stretching has actually been demonstrated to reduce performance rather than increasing it.
I know this is ELI5 and not askscience, but here are some sources anyway:
https://journals.lww.com/nsca-jscr/Fulltext/2010/09000/Effects_of_Static_Stretching_on_Energy_Cost_and.2.aspx
https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1600-0838.2012.01444.x
https://journals.lww.com/nsca-jscr/FullText/2012/02000/Effects_of_Dynamic_Stretching_on_Energy_Cost_and.4.aspx
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